methods of desaturating col ?

Discussion in 'Photoshop Tutorials' started by fgphotog, Oct 21, 2003.

  1. fgphotog

    fgphotog Guest

    fgphotog, Oct 21, 2003
    #1
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  2. fgphotog

    JP Kabala Guest

    the sponge tool desaturates locally, and I prefer using the channel mixer to
    desaturate an entire photo or layer.
     
    JP Kabala, Oct 21, 2003
    #2
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  3. fgphotog

    fgphotog Guest

    is there any disadvantage to using the sponge tool (degradation ?) - as
    opposed to making a selection of the local area & applying the
    hue/saturation slider to it ?

    would you elaborate on using the channel mixer to desaturate
     
    fgphotog, Oct 21, 2003
    #3
  4. fgphotog

    Flycaster Guest

    Open the channel mixer (either global or as an adjustment layer), toggle
    monochrome, then adjust the different channnels to give you the best B&W
    image.
     
    Flycaster, Oct 21, 2003
    #4
  5. fgphotog

    fgphotog Guest

    but I dont want a b&w image - i would still like col but desaturated/muted
     
    fgphotog, Oct 21, 2003
    #5
  6. fgphotog

    Tacit Guest

    but I dont want a b&w image - i would still like col but desaturated/muted

    The images you gave as examples were not desaturated in Photoshop; they were
    shot that way.

    Nevertheless, you can copy your image to a layer, then use the Color Mixer to
    desaturate your image to produce a pleasing B&W image. You can then adjust this
    layer's Opacity to bring back some of the color from the layer underneath.
     
    Tacit, Oct 21, 2003
    #6
  7. fgphotog

    Flycaster Guest

    I answered your question, and in your case it offers a different way to
    strip the bottom layer of color information. The upper layer then becomes
    your color blending layer, with which you can control saturation.

    Have you read the manual? This stuff *is* in there...
     
    Flycaster, Oct 21, 2003
    #7
  8. fgphotog

    JP Kabala Guest

    Thanks... I've been snowed under all day and didn't get back to answer this.

    Go to my page
    http://www.jpkabala.com/PHOTOGALLERY5/index.htm
    and look at the images called "Deco Deli" and "Curves and Angles"

    Curves is a straightforward desaturation done in the channel mixer,
    then I applied a curves adjustment to it to brighten the lights and adjust
    the midtones. Why? because it was shot in color and the building
    needs a coat of paint. When I adjusted the gamma, a lot of the grunge
    -- which was more distracting than atmospheric--vanished. The effect
    is as if I had taken it in better light

    Deco Deli was also shot in full color, then manipulated to only bring in
    the red colors from the original. This is a low-res, compressed copy,
    but I think you can see what I was doing here.

    I copied the background layer twice so that it was set up like this
    --Color Copy
    --Desaturated Copy (using channel mixer to tweak the contrast)
    --Background (original-- I never edit the original.)

    The I used the blending sliders to eliminate all colors other than red in
    the top layer. There were a couple of spots on the floor that had more
    red than I wanted, so I locally desaturated those spots on the top layer
    with the
    sponge tool.
    But the red banquettes and chairs really pop and the color warms up the wood
    tones
    and there's just a hint of the red colors in the posters on the left side
    wall.
    And the one little gray-haired lady in the red outfit was so Miami
    how could I resist her? Getting the sliders set right for this was
    painstaking,
    but I liked it so much when I was done that was glad I took the time.
    The web version looks a little noisy, but at full size and resolution, the
    subtleties of working this way are more obvious-- this is light years more
    attractive than hand tinting a B&W because you don't get that nasty flat-
    paint look or the "I used a highlighter to color this stuff in" effect.

    If you want a good discussion of using the blending sliders
    here's one that deals with layer styles, but the process is the
    same even if there's no style applied
    http://www.arraich.com/effects1/blending.htm
     
    JP Kabala, Oct 22, 2003
    #8
  9. fgphotog

    JP Kabala Guest

    on the money!

    Many folks don't "get" the fact that a good B&W image is not
    just a desaturated color image-- when you convert a color image
    to grayscale, you often have to play with the channels and the contrast
    to get it to look right.

    I saw an old Saturday Night Live rerun a couple of weeks ago, The
    host was Alec Baldwin and they were doing a sketch about a
    "classy" Bronx photographer who specialized in putting
    portraits into images of brandy snifters "through the magic of
    computers." "Oh, my god, Shirley, that's just so elegant!"

    I laughed ....but I'm not sure it's really that funny.

    I was in the mall over the weekend and the promo stuff in the window
    of Glamour Shots was all soft focus grayscale with selectively colored
    areas--
    usually a rose or an American Flag. . .
    why do I think this is going to be the sort of thing we cringe about
    when we open up our albums 10 years from now?
     
    JP Kabala, Oct 22, 2003
    #9
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